Responsive theme string translation with Polylang

<?php
/*
Plugin Name: Polylang for responsive theme
*/

/*
 * This plugin is obsolete since Polylang 1.0 (the functionnality is now included in Polylang)
 */

add_action('admin_init', create_function('', 'get_option("responsive_theme_options");')); // to call the option filter on admin side
add_filter('option_responsive_theme_options', 'translate_responsive_theme_strings');

function translate_responsive_theme_strings($options) {
        if (function_exists('pll_register_string')) { // test polylang is activated
                $strings = array('home_headline',  'home_subheadline', 'home_content_area', 'cta_text',  'cta_url');
                foreach ($strings as $str) {
                        if (is_admin())
                                pll_register_string('responsive theme', $options[$str]);
                        else
                                $options[$str] = pll__($options[$str]);
                }
        }
        return $options;
}